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UDC 628.334.1
Streltsov S. A., Kuriatnikov E. A.
High performance design of trash screens for wastewater treatment
Summary
The reliable operation of the treatment facilities of the municipal wastewater disposal system depends significantly on the efficiency and robustness of the trash screens installed in the head of the process flow at the treatment facilities. In addition trash screens not only protect the equipment from blockages but also prevent suspended solids from polluting natural water bodies receiving effluents. In order to improve the efficiency of trash capture the use of RS screen is recommended. It is highly resistant to mechanical damage caused by large-size impurities in wastewater which results in the reduction of the failure rate and the amount of repair works. The screen design includes a device for additional rake cleaning during the reverse movement to completely eliminate any risk of the rakes being wrapped with filamentary inclusions during the operation. An original mechanism of driving chain tensioning provides for eliminating rake jerking and skewing. The design ensures screen self-sealing in the process of installation into the channel to eliminate unscreened water breakthrough between the frame and channel walls. For the period of RS screens operation the following results were noted: full absence of filter cloth clogging; 3–4 fold screen output increase compared to the previously operated models; reduction of bottom sediments in the channel before the screens; high reliability in case of peak discharge of filamentary inclusions; reduction of energy consumption.
Key words
treatment facilities , wastewater , mechanical treatment , water treatment equipment , trash screen
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DOI 10.35776/VST.2021.12.06
UDC 628.33
Kalachev D. A., Wolfgang Branner
Mechanical treatment of wastewater
Summary
The selection of equipment for mechanical wastewater treatment is an important stage in the reconstruction or new construction of the treatment facilities that determines their efficiency and reliability in terms of the technology and operation. The examples of the currently widespread technical solutions for designing filtering cloth of the screens for mechanical wastewater treatment are given. The effectiveness of these solutions is compared. On the basis of studying wastewater treatment facilities in Germany, a comparison of the debris retention efficiency depending on the applied filtration grade, i. e., two-dimensional (perforation) and one-dimensional (bar spacing) is presented.
Key words
wastewater , mechanical treatment , grate , removed screenings , bar space , perforation , two-dimensional cloth
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DOI 10.35776/VST.2022.04.05
UDC 628.33:628.212.2
Vereshchagina Lidiia, Khudiakova Dar’ia, Gromov Grigorii
Principal directions for improving process flow schemes and designs of units for surface runoff treatment
Summary
The issues of surface runoff treatment from the territories of communities of various functional purposes are considered, in particular, the improvement of process flow schemes and designs of low-capacity local treatment facilities of flow-through or storage type, that discharge the effluents into the public wastewater disposal systems and water bodies. The features of the organization of systems for the surface runoff disposal and treatment, as well as the provisions of the water and environmental legislation of the Russian Federation and design code that have come into force over the past 2 years are given. It is noted that in the context of the transition of the federal regulation of wastewater discharge to technological regulation based on the best available technologies, the scope of small-capacity facilities of flow-through and storage type tends to expand. This is due to the fact that the customers are allowed to use them while discharging surface runoff into the public wastewater disposal systems of the communities, provided the quality of effluents received by these systems comply with the regulatory requirements. Principal schemes of the flow-through and storage type facilities for surface runoff treatment in combination with tertiary treatment plants are given. Casings of underground tanks and vessels, including improved flow-through units for the primary mechanical treatment of surface runoff, are made of fiberglass pipes of increased ring stiffness and durability.
Key words
mechanical treatment , thin layer sedimentation , surface runoff , wastewater management systems , storage settling tank , treatment facilities of flow-through and storage type , filtration-sorption tertiary treatment , open hydraulic cyclone , fiberglass pipes
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UDC 628.334
Khrekov N. B., Borisov V. Ya.
Enhancement of Operation Efficiency of Mechanical Treatment Plant of Samara’s Aeration Station
Summary
Problems of the treatment of wastewater of the Samara’s city aeration station connected with ineffective operation of mechanical screens are described. The substantiation of the choice of mechanical screens PC manufactured by PSP Prommashservis Ltd. for the replacement of obsolete equipment and also steel of 12X18H10T grade for manufacture of screens PC is made. The distinctive features of the screens that distinguish them among analogues are presented.
Key words
wastewater , mechanical treatment , electric drive , grate , frequency converter , filter fabric , aeration station , hydro-press
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UDC 628.35
Esin M. A., Smirnov Aleksandr Vladimirovich, Sokolov A. N.
Commissioning – the key stage of putting treatment facilities into operation
Summary
The issues related to the commissioning of the equipment and wastewater treatment facilities are considered. A brief review of the history of commissioning the facilities in the Soviet Union and in present day Russia is given. The problem areas of adjusting every equipment assembly, the algorithm of work performance and the required results are shown. The attainment of sustainable performance is provided by quality and skilled commissioning. Correct visual evaluation of the equipment state carried out during the acceptance for commissioning procedure is very important. Nonobserved defects and faults in the process line will cause fast assembly fail which can result in an accident. The principles of «My Project» Company activities related to commissioning are presented. Special attention is paid to adjusting biological treatment in aeration tanks: from the front end engineering to the routine maintenance of the assembly.
Key words
wastewater , biological treatment , mechanical treatment , aftertreatment , facilities reconstruction , commissioning , erection supervision
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UDC 628.334
Shchetinin A. I., Marchenko Yu. G.
Up-To-Date Equipment and Facilities for Mechanical Treatment of Wastewater from Coarse-Disperse Admixtures
Summary
Up-to-date equipment for wastewater treatment from coarse-disperse admixtures is considered. Designs of screens are described briefly, their advantages and shortcomings are presented. Formulas for calculation of head loss on sreens are presented. Recommendations to install screens with openings not less than 5 mm are made. The comparative analysis of different methods of sand-catchers design shows that the normative time of stay in sand catchers can be extended up to 10 minutes. Literary data treatment has made it possible to obtain formulas offered as a new calculation base for determination of efficiency of horizontal and aerated sand catchers during the designing. Up-to-date equipment for sand collection and removal is considered.
Key words
wastewater , mechanical treatment , hydrocyclone , aeration tank , screens , sand catchers
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UDC 628.3
Smirnov Aleksandr Vladimirovich
Advanced engineering and experience of BAT implementation
Summary
The use of the Information-Technical Guidebook on the best available techniques «Wastewater treatment in public wastewater disposal systems of communities, urban districts» (ITS 10-2015) provides for only a general idea of the catalogue of technologies that have to be applied in order to ensure high efficiency of wastewater treatment. The choice and substantiation of a particular technology are carried out on the basis of the operation experience and comprehensive project engineering. Case studies of using «MY Technologies» that are ready-made technical solutions of mechanical («MY MET») and biological («MY BIO») wastewater treatment for the wastewater treatment facilities in Sochi, Vologda, Kolomna are presented.
Key words
wastewater , biological treatment , mechanical treatment , best available techniques , primary treatment , fine purification , «MY Technologies» , «MY MET» , «MY BIO»
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DOI 10.35776/VST.2021.05.04
UDC 628.35:661.5
Kondrashev Viacheslav, Metelitsa Sergei
Stages of launching a biological treatment plant at the wastewater treatment facilities with dosing easily oxidable organic matter
Summary
Issues related to commissioning a biological treatment plant at the facilities for household and similar in composition wastewater treatment during the trial start of the treatment facilities are considered. The stages of commissioning a biological treatment plant at the wastewater treatment facilities with «inoculating» activated sludge from the operating biological treatment facilities and with dosing easily oxidable organic matter are considered in detail. The equipment configuration of the WWTP-9 produced by Germes Group is described. All stages of the biological treatment plant commissioning are considered through the example of the start-up of WWTP-9 with the use of numerous experimental data. The periods of biological treatment plant commissioning stages have been determined. The problems of adjusting the biological treatment plant and the ways of their elimination to achieve the required result are presented. The technology used at the WWT facilities provides for the effluent quality that meets the requirements for the discharge into a water body of commercial fishing importance.
чения.
Key words
wastewater , biological treatment , mechanical treatment , aftertreatment , commissioning , biological treatment plant
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